The Gobbling Monsters within the Hot DOGs

Hot, Dust-Obscured Galaxies, or Hot DOGs, are a class of distant dust-enshrouded galaxies with extremely high luminosity, including several "Extremely Luminous Infrared Galaxies" (ELIRGs) that reach 10^14 L_Sun. Selected by their utmost red colors in WISE bands, their SEDs incorporating WISE, Spitzer, and Herschel photometry indicate that hot dust dominates the bolometric luminosity. The SED analysis suggests a close-to-spherical dust distribution with a range of temperatures. These hyperluminous sources are likely powered by highly obscured active galactic nuclei (AGN), and are unlikely to be lensed. The measured masses of the monstrous black holes within these Hot DOGs reflects that they are accreting at a rate close to the Eddington limit. The X-ray observations indicate that they might be intrinsically X-ray weak. The ALMA C+ observation on selected sample shows a large, homogeneous velocity dispersion across few kpc, implying that gas is being blown away isotropically. This hyperluminous, highly obscured population may represent a special evolutionary stage prior to the red quasar and optical quasar phases.

Tsai Chao-Wei
KIAA, 1st meeting room
Wed, 2017-12-13 12:00 to 13:00